Mentalfreaky

Today I relogged to my tekkit server but it showed the message "You require these mods to play on this server - (List of mods like EE, IC2 nuclear control). Naturally I have updated my server to the recent recommended release and made sure that my launcher is updated too. Two of the four server residents have no problem getting on. I have asked them and they said they had done nothing which is exactly the same as I had at the start. However, it still hasn't worked. Any ideas?